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SMC3 Utils & INO file-Need to run 3rd motor @ 25kHz

Discussion in 'Miscellaneous' started by Eli Wizard, Feb 16, 2026 at 18:27.

  1. Eli Wizard

    Eli Wizard New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi All,

    my third motor is exclusively for heave and SMC3 UTIL 'motor3' only gives 4 or 31 kHz as options. Can I simply edit the file to 15 kHz? "Timer2FreqkHz = 15" And have all motors on 15kHz. Failing that my other option is to swap my least motor stressed to 3 as the heave axis is the one most stressed.

    Tks
    Last edited: Feb 16, 2026 at 21:13
    Eli Wizard, Feb 16, 2026 at 18:27
    #1
  2. Gadget999

    Gadget999 Well-Known Member

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    No, its because of the arduino board

    Uee another board, or 2 arduino uno boards
    Gadget999, Feb 17, 2026 at 15:35
    #2
  3. Eli Wizard

    Eli Wizard New Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Thanks for your reply.
    Could you give an example of "another board" (mega?), and or point me to a guide on using two Arduino?
    Is the second board "Interface B"?

    What is the limitation of the Uno?
    Eli Wizard, Feb 17, 2026 at 15:52
    #3
  4. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    just use 2x arduino - simtools can use more than one board at a time

    2 motors on one and 1 on the other

    alternatively look for a comnpatible board with more pwm pins - you may need to make chages to the code
    Gadget999, Feb 18, 2026 at 12:07
    #4
  5. Eli Wizard

    Eli Wizard New Member

    Joined:
    Jan 22, 2017
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    Location:
    Ottawa
    Balance:
    40Coins
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    +1 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino
    For now I'll just swap motors around. Motor2(roll) has the least load kp=150 maxpwm=200 compared to the needs of heave kp=380, maxpwm= 200. These are puny Honda wiper motors.
    I'm looking at the Arduino DUE and guess that I'll have to tune using SMC3 then use IDE to write frequencies into the code.
    I know I can use two arduino I'd like to avoid another long USB cable. Would a powered USB hub handle the Wheel and the two Arduino providing individual com ports?
    Thanks for your input.
    Eli Wizard, Feb 18, 2026 at 12:57
    #5